Mining machine



June 24, 1930. F. B. MILLER 1,766,395

MINING MACHINE I Filed Sept., 13. w29 2 Sheets-Sheec' 'l June 24, 1930.l nB. MILLER 1,766,395

MINING MACHINE I l Filed Sept. 13, 1929 2 Seets-Sheec 2 MAA n nnn VPatented June 24, 1930 FREDERICK B. MILLER, or soor'mnnrn, PENNSYLVANIAMINING MACHINE Application filed September 13, 1929. Serial No. 392,449.

This invention relates to advancing and retracting mechanism for miningmachines, and, while not limited thereto, relates more particularly tomechanism for advancing and '5, retracting mining machines like thatshown and described in my prior United States Patent No. 1,643,000,dated September 20, 1927.

One object of this invention is to provide an advancing mechanismcapable of resisting the force exerted by the mining machine against theface of the coal. Another object is to provide advancing mechanism whichmay be operated and repositioned without interfering with the operationof the machine.

Other and various objects and advantages will be apparent from thefollowing speciiication and drawings.

1n the drawings- Figure 1 is a side elevation showing the mining machinein advanced position.

Figure 2 is a similar view showing the skid base advanced by themachine.

Figure 3 is a similar view showing the anchor-bar advanced and theapparatus in readiness for further advance of the machine.

Figure l is a plan of the apparatus positioned as shown in Figure 1. 4

Figure 5 is a sectional view taken on the line V-V oi Figure l.

Figure 6 is a sectional view taken line VI-VI oi' Figure 1.

Figure 7 is a sectional view taken on the line VII-VH of Figure 1.

Referring more particularly to the drawings, the latter A designates themining machine as a whole which is slidably mounted on a skid base 10.The machine A is provided with a pinion 12 which is meshed with a rack11 on the base 10. The pinion 12 is adapted to be driven in reversedirections by the power drive of the machine (not shown).

lllhe base is provided at its rear end with a pair of spaced lugs 13. Ananchor-bar 14 is provided with a head 16 which is mounted between thelugs 13 and pivotally connected thereto by a pin 17. A secondtubularanchorbar is telescoped over the bar 14. The

on thc bars 14 and 15 are provided with holes 32- 33, respectively,adapted to be registered to receive a removable locking pin 18- whichserves to lock the bars against telescoping movement. v

TheV anchor-bar 15 is provided with holes 19 to receive a pin 29 forlocking or securing the bar to a jack (to be described). l

At the rear of the mining machine A a jack B is mounted. The jack Bcomprises a base-plate 20, a base 21, a screw 22, column 23,bearing-plate 24, and a cap-piece 25. The base-plate 20 is' recessed toform a seat in which the base 21 is seated. The base 21is U-shaped so asto bridge the anchor-bar 15. Each leg of the U-shaped baseis provided`with holes 34 which are adapted to be alined with the holes 19in the bar15 to receive the pin 291er locking the bar 15 to the jack. The topVface of the base 21 is recessed to form a concave socket 27 in which theballshaped lower end 28 of the screw 22 is seated. The column 23 isthreaded for the reception of the screw 22. When the screwis rotated toexpand the jack the cap-piece will be forced against the mine root andthe baseplate will beiforced against the mine floor, thus securing thejack in position.

The Yanchor bar 14 is provided with a lug 31 at its forward end and whenit is desired to advance the base 10 in the manner to be described, astrut 30 is placed between the lug 31 and the machine A.

In positioning the mining machine the anchor-bars and jack will bepositioned and assembled with the machine A at its rearmost position ontheskidbase 10. The machineA is then advanced by the power pinion 12travelling on the rack 11.

When the forward limit of travel of the machine -A on the base 10 isreached] it will be4 necessary toadvance the `base 10, as shown linFigure i 2, vin order to permit4 `further advance of the machine. l/Vhenthe machine has reached its forward limitof travel on the base 10 this`strut 30v will be mounted between the lug 31v`on the bar 14 and themachine, and the pin 18 will be removed. p The pinion 12 will then be,operated in the reverse direction to pull the base 10 and inner bar 15forwardly to the position shown in Figure 2. After the base l0 and barl5 are advanced the strut 3() will be removed and the bar le releasedfrom the jack B and advanced until the holes are again in alinement. Asecond jack will be previously placed in advance of the first jack andthe bar 14 will be locked to the base of the second jack by the pin 29and the bars 14 and 15 will be locked against relative movement by theinsertion of the pin 18 through the holes 32-33.

The machine as will be readily seen, is again free to move forward andbackward on the base l0 within the limits of the rack 11. v

`While I have shown and described a specific embodiment of my invention,it will be understood that I do not wish to be limited thereto sincevarious modifications may be made without departing from the scope of myinvention, as defined in the appended claims.

I claim:

l. The combina-tion with a mining machine of a skid base, a tractionpinion on said machine, a rack on said base with which said pinion ismeshed, `a telcscoping anchor-bar connected to said base, a jack, meansremovably connecting said bar to said jack, and means for removablylocking said bar against telescoping movement.

2. The combination with a mining machine o-f a skid base, a reversibletraction pinion on said machine, a rack on said base with which saidpinion is meshed, an anchorbar pi-votally connected tojsaid base', ajack, a second anchor-bar telescopicall-y connected tosaidf first namedbar and removably secured to said jack, and means for d'etachablylocking said bars against telescoping movement.

3. The combination with a' mining machine of a skid base, a reversibletraction pinion on said machine, a rack on said base with which saidpinion is meshed, an anchor-bar pivotally connected to said base, asecond anchorab'ar telescopically mounted over said first named bar, ajack, means for detachably connecting said second named bar to saidjack, and means for detachably locking said bars against telescopingmovement, a lug on saidV second named bar, and a rigid strut adaptedI tobe removably mounted between said lug and said machine to permt saidmachine to advance said base and said first named barby the opera-tionof said pinion on said rack when said bars are released for relativemovement.

4'. The combination with a mining ma'- chine ofa skid base, a reversibletraction pinion on said'y machine, a` rack on saidv base with which saidpinion is meshedan anchorbar pivotalfly connected to said base, a secondanchor-bar connected to and movable longitudinally relative to saidvfirst named bar, a jack, means for detachably connecting saidsecondnamedibar'to said'jack, andf'means for my hand. A

FREDERICK B. MILLER.

leoY

uit

